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package de.pixart.messenger.utils;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.preference.PreferenceManager;
import android.util.Log;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import de.pixart.messenger.Config;
import de.pixart.messenger.R;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.entities.Conversation;
import de.pixart.messenger.entities.Message;
import de.pixart.messenger.services.XmppConnectionService;
import de.pixart.messenger.ui.ConversationActivity;
import de.pixart.messenger.xmpp.jid.InvalidJidException;
import de.pixart.messenger.xmpp.jid.Jid;

public class ExceptionHelper {
    private static SimpleDateFormat DATE_FORMATs = new SimpleDateFormat("yyyy-MM-dd");

    public static void init(Context context) {
        if (!(Thread.getDefaultUncaughtExceptionHandler() instanceof ExceptionHandler)) {
            Thread.setDefaultUncaughtExceptionHandler(new ExceptionHandler(
                    context));
        }
    }

    public static boolean checkForCrash(ConversationActivity activity, final XmppConnectionService service) {
        try {
            final SharedPreferences preferences = PreferenceManager
                    .getDefaultSharedPreferences(activity);
            boolean crashreport = preferences.getBoolean("crashreport", true);
            if (!crashreport || Config.BUG_REPORTS == null) {
                return false;
            }
            List<Account> accounts = service.getAccounts();
            Account account = null;
            for (int i = 0; i < accounts.size(); ++i) {
                if (!accounts.get(i).isOptionSet(Account.OPTION_DISABLED)) {
                    account = accounts.get(i);
                    break;
                }
            }
            if (account == null) {
                return false;
            }
            final Account finalAccount = account;
            FileInputStream file = activity.openFileInput("stacktrace.txt");
            InputStreamReader inputStreamReader = new InputStreamReader(file);
            BufferedReader stacktrace = new BufferedReader(inputStreamReader);
            final StringBuilder report = new StringBuilder();
            PackageManager pm = activity.getPackageManager();
            PackageInfo packageInfo;
            try {
                packageInfo = pm.getPackageInfo(activity.getPackageName(), PackageManager.GET_SIGNATURES);
                report.append("Version: " + packageInfo.versionName + '\n');
                report.append("Last Update: " + DATE_FORMATs.format(new Date(packageInfo.lastUpdateTime)) + '\n');
                Signature[] signatures = packageInfo.signatures;
                if (signatures != null && signatures.length >= 1) {
                    report.append("SHA-1: " + CryptoHelper.getFingerprintCert(packageInfo.signatures[0].toByteArray()) + "\n");
                }
                report.append('\n');
            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
            String line;
            while ((line = stacktrace.readLine()) != null) {
                report.append(line);
                report.append('\n');
            }
            file.close();
            activity.deleteFile("stacktrace.txt");
            AlertDialog.Builder builder = new AlertDialog.Builder(activity);
            builder.setTitle(activity.getString(R.string.crash_report_title));
            builder.setMessage(activity.getText(R.string.crash_report_message));
            builder.setPositiveButton(activity.getText(R.string.send_now),
                    new OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                            Log.d(Config.LOGTAG, "using account="
                                    + finalAccount.getJid().toBareJid()
                                    + " to send in stack trace");

                            Conversation conversation = null;
                            try {
                                conversation = service.findOrCreateConversation(finalAccount,
                                        Jid.fromString(Config.BUG_REPORTS), false, true);
                            } catch (final InvalidJidException ignored) {
                            }
                            Message message = new Message(conversation, report
                                    .toString(), Message.ENCRYPTION_NONE);
                            service.sendMessage(message);
                        }
                    });
            builder.setNegativeButton(activity.getText(R.string.send_never),
                    new OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            preferences.edit().putBoolean("crash_report", false)
                                    .apply();
                        }
                    });
            builder.create().show();
            return true;
        } catch (final IOException ignored) {
            return false;
        }
    }

    public static void writeToStacktraceFile(Context context, String msg) {
        try {
            OutputStream os = context.openFileOutput("stacktrace.txt", Context.MODE_PRIVATE);
            os.write(msg.getBytes());
            os.flush();
            os.close();
        } catch (IOException ignored) {
        }
    }
}